A billionaire AI boss sued a contractor after claiming he damaged his $40 million Malibu beach investment property while installing a system designed to protect the home from wildfires.

Daniel Nadler, 42, the CEO of OpenEvidence — a Google-backed artificial intelligence company described as “ChatGPT” for doctors — filed the lawsuit Tuesday morning about his investment property before it was mysteriously withdrawn hours later.

The lawsuit, which The Post understands will be refiled, accused contractor and ex-firefighter Robert Milstein of smashing his “heavy vehicle” into the exterior wall of the sprawling oceanfront estate, which Nadler claims slashed the home’s value by “millions.”

The architect-designed beachfront home features rare rammed-earth walls meant to resemble weathered coastal stone.

Milstein, who runs SoCal Fire Supply, had been setting up a fireproofing system at the mansion on October 9, 2025.

The veteran ex-volunteer firefighter has assisted during major fire emergencies and has spent two decades building a reputation as a firefighting hero in the Santa Monica Mountains.

He helped save the famed Calamigos Ranch during the devastating 2018 Woolsey Fire and is credited by locals with defending Big Rock during January’s Palisades Fire, helping evacuate hundreds of residents while saving millions of dollars in property.

The lawsuit alleges Milstein damaged “multiple rammed earth panels, compromising the panels’ exterior façade.”

Nadler claims the wall’s rare composition means “partial repairs will only further the damage and create a patchwork-like blight to a wall that was intended to appear as one continuous, weathered stone.”

But Milstein insists the damage is overstated.

Speaking exclusively to The Post, the firefighter said he took “full responsibility” for the accident, explaining he had been rushing to move his truck.

Milstein said he failed to notice a cabinet door on the truck had been left open, causing it to strike the stone wall as he reversed.

Photos taken afterward appear to show damage to two exterior panels.

“I took full responsibility. I try not to cause any problems for my clients,” Milstein said.

The lawsuit also includes an email in which Milstein admitted fault.

“I’m 100% at fault and take full responsibility,” Milstein wrote, adding that he had been in a “rush” and had insurance coverage.

Milstein claims his insurer, Progressive, offered $158,000 to repair the damage because of the unique materials used on the home — but says Nadler’s insurance claim stated a price tag of $610,000.

“He wanted me to replace panels that were previously damaged,” Milstein claimed.

Nadler’s attorney Stephen Broome confirmed: ”Nadler has never lived there and bought the property as an investment.  

”The dispute is between an investor LLC that owns the home and Mr. Milstein’s insurer, Progressive Insurance Company.”

”The disagreement is over Progressive’s insistence on a repair approach that would leave the investment property — a property bought as an investment — in a lesser condition than before the incident,” Broome said.

Milstein claims the legal action is not only for the full replacement cost, but also the alleged diminished value of the property, which could allegedly run into the “multi-millions.”

However, Broome said filing the suit against Milstein was ”the only available legal mechanism to compel Progressive to meaningfully participate in the resolution of its own coverage dispute — Because the amount in dispute falls within Mr. Milstein’s coverage.

”He will not pay a cent out of pocket.”

The Malibu estate was purchased through an LLC for $27.1 million in July 2025, though the lawsuit suggests the property may now be worth as much as $40 million.

The legal filing claims the impact “opened an actual gap in the building envelope, creating an immediate and ongoing risk of water intrusion, moisture penetration, mold formation, structural compromise, and accelerated coastal weathering,” allegedly creating safety risks for Nadler and his family.

Milstein, whose clients include Star Wars actor Mark Hamill, said he hired a structural engineer to inspect the damage.

A letter from the engineering firm stated it “appeared highly unlikely that there was any damage to the supporting structural wall or the foundation of the house.”

The beachfront mansion was previously praised by California Home and Design magazine for its “architectural distinction,” particularly the rammed-earth panels that “bring the variegated colors of the sand” into the home’s interior.

The roughly 4,000-square-foot property features a pool, cabana and sweeping ocean views.

According to Forbes, Nadler has an estimated net worth of $7.6 billion.

The Canadian-born entrepreneur previously founded Kensho Technologies, which was acquired by S&P Global in 2018.

In July 2025, Nadler also paid $38.2 million cash for a furnished 6,000-square-foot triplex penthouse at the Four Seasons Residences in Surfside, Florida.

Despite Nadler’s immense wealth, Milstein said he was not intimidated.

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“He thinks he’s going to scare me. It’s not legit,” Milstein said.